{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-53484", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-10-01T11:39:39.402Z", "datePublished": "2025-10-01T11:42:52.590Z", "dateUpdated": "2026-08-05T09:14:18.959Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:14:18.959Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlib: cpu_rmap: Avoid use after free on rmap->obj array entries\n\nWhen calling irq_set_affinity_notifier() with NULL at the notify\nargument, it will cause freeing of the glue pointer in the\ncorresponding array entry but will leave the pointer in the array. A\nsubsequent call to free_irq_cpu_rmap() will try to free this entry again\nleading to possible use after free.\n\nFix that by setting NULL to the array entry and checking that we have\nnon-zero at the array entry when iterating over the array in\nfree_irq_cpu_rmap().\n\nThe current code does not suffer from this since there are no cases\nwhere irq_set_affinity_notifier(irq, NULL) (note the NULL passed for the\nnotify arg) is called, followed by a call to free_irq_cpu_rmap() so we\ndon't hit and issue. Subsequent patches in this series excersize this\nflow, hence the required fix." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable code is reached only through local device-configuration and teardown paths (`ethtool -L`/set-channels, interface down, devlink SF/VF teardown, driver unbind) that drive `irq_cpu_rmap_remove()` and `free_irq_cpu_rmap()`. No remote packet or protocol data reaches `lib/cpu_rmap.c`; the RFS receive path only reads `rmap->near[]`, not the freed glue objects.\nAC:L - The use-after-free is deterministic and requires no race — releasing an IRQ vector leaves a stale `rmap->obj[]` entry that the subsequent `free_irq_cpu_rmap()` walk unconditionally dereferences, and the attacker fully controls the ordering and timing of both steps. `CONFIG_RFS_ACCEL` is `default y` (depends on `RPS`), so the required configuration is the norm on distro kernels, and the unbounded window between free and walk lets the attacker reliably groom the `kmalloc-64` slab.\nPR:L - Triggering requires CAP_NET_ADMIN over the affected netdev (ethtool set-channels, link down, devlink SF removal), which per kernel-CNA guidance scores as Low rather than High. In common SR-IOV/container deployments an mlx5 VF netdev is delegated into a network namespace owned by a user namespace, giving an otherwise unprivileged container-local user exactly this capability over the device.\nUI:N - No victim action is needed; the attacker performs both the IRQ-vector release and the subsequent rmap teardown entirely on their own via device reconfiguration.\nS:U - The freed object, the corrupted state, and the resulting impact are all within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a use-after-free on a `kmalloc-64` GFP_KERNEL object with an attacker-paced reclaim window, so the freed `struct irq_glue` can be reoccupied with sprayed data; the attacker-controlled `notify.irq` then selects an arbitrary `irq_desc`, and the resulting refcount underflow and indirect `->release` call chain can be leveraged into arbitrary kernel memory disclosure.\nI:H - After reclaiming the freed glue, `irq_set_affinity_notifier(glue->notify.irq, NULL)` performs an arbitrary IRQ-descriptor lookup and issues spurious `kref_put(&old_notify->kref, old_notify->release)` calls on a live notifier, producing refcount underflow, premature free, and an indirect call through a function pointer — a control-flow hijack primitive rather than a mere crash.\nA:H - Even unweaponized, dereferencing the freed glue and passing garbage to `irq_set_affinity_notifier()` corrupts unrelated IRQ descriptor state and oopses/panics the kernel during device teardown, and the double kref_put can prematurely free the cpu_rmap itself." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "lib/cpu_rmap.c" ], "versions": [ { "version": "896f97ea95c1d29c0520ee0766b66b7f64cb967c", "lessThan": "981f339d2905b6a92ef59358158b326493aecac5", "status": "affected", "versionType": "git" }, { "version": "896f97ea95c1d29c0520ee0766b66b7f64cb967c", "lessThan": "d1308bd0b24cb1d78fa2747d5fa3e055cc628a48", "status": "affected", "versionType": "git" }, { "version": "896f97ea95c1d29c0520ee0766b66b7f64cb967c", "lessThan": "cc2d2b3dbfb0ba57bc027fb7e1121250c50e4000", "status": "affected", "versionType": "git" }, { "version": "896f97ea95c1d29c0520ee0766b66b7f64cb967c", "lessThan": "f748e15253833b771acbede14ea98f50831ac289", "status": "affected", "versionType": "git" }, { "version": "896f97ea95c1d29c0520ee0766b66b7f64cb967c", "lessThan": "c6ed54dd90698dc0744d669524cc1c122ded8a16", "status": "affected", "versionType": "git" }, { "version": "896f97ea95c1d29c0520ee0766b66b7f64cb967c", "lessThan": "c9115f49cf260d24d8b5f2d9a4b63cb31a627bb4", "status": "affected", "versionType": "git" }, { "version": "896f97ea95c1d29c0520ee0766b66b7f64cb967c", "lessThan": "67bca5f1d644f4e79b694abd8052a177de81c37f", "status": "affected", "versionType": "git" }, { "version": "896f97ea95c1d29c0520ee0766b66b7f64cb967c", "lessThan": "4e0473f1060aa49621d40a113afde24818101d37", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "lib/cpu_rmap.c" ], "versions": [ { "version": "3.8", "status": "affected" }, { "version": "0", "lessThan": "3.8", "status": "unaffected", "versionType": "semver" }, { "version": "4.14.316", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.284", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.244", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.181", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.113", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.30", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.3.4", "lessThanOrEqual": "6.3.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.4", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "4.14.316" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "4.19.284" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "5.4.244" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "5.10.181" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "5.15.113" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "6.1.30" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "6.3.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "6.4" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/981f339d2905b6a92ef59358158b326493aecac5" }, { "url": "https://git.kernel.org/stable/c/d1308bd0b24cb1d78fa2747d5fa3e055cc628a48" }, { "url": "https://git.kernel.org/stable/c/cc2d2b3dbfb0ba57bc027fb7e1121250c50e4000" }, { "url": "https://git.kernel.org/stable/c/f748e15253833b771acbede14ea98f50831ac289" }, { "url": "https://git.kernel.org/stable/c/c6ed54dd90698dc0744d669524cc1c122ded8a16" }, { "url": "https://git.kernel.org/stable/c/c9115f49cf260d24d8b5f2d9a4b63cb31a627bb4" }, { "url": "https://git.kernel.org/stable/c/67bca5f1d644f4e79b694abd8052a177de81c37f" }, { "url": "https://git.kernel.org/stable/c/4e0473f1060aa49621d40a113afde24818101d37" } ], "title": "lib: cpu_rmap: Avoid use after free on rmap->obj array entries", "x_generator": { "engine": "bippy-1.2.0" } } } }